Abstract: The transmission is one of the core components of the tractor, and its performance has an important impact on the tractor’s power performance, fuel economy and other indicators.Power Shift Transmission（PST） does not interrupt the power output when shifting, which can reduce the operating difficulty of the tractor and improve the working efficiency.The application of power shift technology can greatly promote the modernization of agricultural production, improve the level of agricultural mechanization, and assist the rural revitalization strategy.At present, tractor power shift technology has been widely used in the international market.China’s agricultural machinery industry started late, and there is still a certain gap compared with international advanced technology.This paper mainly introduces the basic principle of power-shift transmission, the research status at home and abroad, expounds the key technology of power-shift transmission, and analyzes the development trend of power-shift technology for agricultural tractors.